a title or explanation for a picture or illustration, especially in a magazine.
a heading or title, as of a chapter, article, or page.
Movies, Television . the title of a scene, the text of a speech, etc., superimposed on the film and projected onto the screen.
Law . the heading of a legal document stating the time, place, etc., of execution or performance.
verb (used with object)
to supply a caption or captions for; entitle: to caption a photograph.
We're extending last week's caption contest for another week.
The caption is an extremely important piece of the entry.
The birds are indeed cormorants and the caption has been updated.